The girl's mother let the child's older boyfriend move into their home when she was 11, and reportedly allowed the two to sleep in the same bed.

When the girl's father, who was separated from her mother, found out about this he pleaded with DoCS staff to do something but they failed to act, Dubbo MP Dawn Fardell said.

He took custody of his daughter in March after his ex-wife was placed in a mental health unit, which was when he discovered she was pregnant, Ms Fardell told NSW Parliament in March.

"The father is beside himself," she said.

DoCS this morning acknowledged it had been aware of the girl's case.

"DoCS had received reports about this girl previously," a spokeswoman said.

"Because of more urgent cases, the department took some action to investigate this case, but acknowledges more intensive casework could have been done."

Community Services Minister Linda Burney said her department's response had not been adequate.

"It's my view that we did not do enough in the case of intervening for this young girl," she told 2GB this morning.

DoCS was now working closely with the family, and would provide counselling and parenting services for the girl and "look at the best options for the baby", the DoCS spokeswoman said.

The girl's father and his partner would raise the baby, Ms Fardell said.

She said the girl's father had also claimed his daughter's boyfriend had "a history" and was "known to all the services".